HomeMy WebLinkAbout2018-08-28 JM BOS-SC Packet - Released JOINT SELECTMEN AND SCHOOL COMMITTEE MEETING
Tuesday, August 28, 2018
Estabrook Hall, Cary Memorial Building
6:00 PM
AGENDA
ITEMS FOR INDIVIDUAL CONSIDERATION
1. Review of Lexington Children's Place Heating/Cooling Systems (30 min.) 6:00 p.m.
ADJOURN
1. Anticipated Adjournment 6:30 p.m.
The next regularly scheduled meeting of the Board of Selectmen is scheduled for Wednesday,
September 5, 2018 at 7:00 p.m. in the Selectmen's Meeting Room, Town Office Building, 1625
Massachusetts Avenue.
Hearing Assistance Devices Available on Request �
All agenda time and the order of items are approximate and IlJ � 111a
subject to change. Recorded by LexMedia
AGENDA ITEM SUMMARY
LEXINGTON JOINT BOARD OF SELECTMEN AND SCHOOL COMMITTEE MEETING
AGENDA ITEM TITLE:
Review of Lexington Childreds Place Heating/Cooling Systems (30 min.)
PRESENTER: ITEM
NUMBER:
Mike Cronin, Director of Facilities and
Donna DiNisco, DiNisco Design
SUMMARY:
The design team has fOUnd that is it not feasible to rLin the three separate electric heating systems (for each
wing of the bUilding)with the 150KW generator. When Using the emergency generator for power, the VRF
system COLIld be set LIP with an alternating schedule, 20 minUtes for the main office and 40 minUtes for the
classrooms. This will keep the classrooms at approximately 60 degrees and the main office SUite above
freezing(when OLItSide temperatUres are above zero degrees), bUt OCCUpants COLIld not continUe to work and
learn over a longer period of time. The recommendation is to SLIPPlement the VRF system with a natUral gas
fired element. If this is done, there WOLIld be no climate iSSUes during a power OLItage.
SUGGESTED MOTION:
FOLLOW-UP:
DATE AND APPROXIMATE TIME ON AGENDA:
8/28/2018 6:00 p.m.
ATTACHMENTS:
Description Type
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Memorandum
Date: 26 January 2018
REVISED 01 February 2018
From: DiNisco Design, Inc.
Reference: Lexington Children's Place
Subject: Gas Heating Recommendation
Based upon our meeting on Friday, January 12, 2018, it is the design team's recommendation to
add a gas heating section to the ERLI for situations such as a loss of power to maintain a 600
temperature while students and staff remain in the building as well as in case of extreme cold
weather. New England has been experiencing increasingly extreme weather patterns as evidenced
by recent cold spells which were well below Massachusetts winter design condition of 7°F.
The VRF system's heating performance decreases as outside temperature falls. The selected VRF
system is capable of operating down to -1 30F outside, but at that point the system rating falls to
85%, and at below -1 30F manufacturers do not have published performance data.
Mitsubishi indicates that their system would run down to -18°F, but they do not have
published performance data which we can base our design on. Until such published data
is provided, we can only count on Mitsubishi system to work down to -13°F.
VRF system will not operate when:
1. Outside temperature falls below -1 30F.
2. Outdoor unit is buried under snow.
3. System malfunctions.
The current plan in case of a power outage:
1. Gas fired emergency generator operates (150 kW).
2. ERLI remains off.
3. Generator is capable of operating two out of three VRF systems.
4. The DDC system will alternate the three systems within above limitations to maintain the
classrooms at around 60OF and to maintain the Administration area above freezing, down to
outside temperature of about 0°F.
I'D 0 IN IN A [D I Iq I S C 0 1 III C i i A ICE I'D IR I C I Cis ARY AIN&I I I I Iiq 0 IF:I I I F-1 IF.3 I
....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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Memorandum, 26 January 2018. REVISED 01 February 2018 Page
The recommended plan:
1. Add a gas heating section to the ERU to be used strictly for emergency conditions only.
2. The emergency conditions can heG power outage 0r one 0f the VRFsystems
malfunctioning.
3. Under an emergency condition, the ERU's VRF component will be cle-energized, exhaust
fan shut off, supply fan operates with 100% outside air and the gas furnace operates to
provide heated supply air t0 pressurize the building. Some ER0V"s may not have
separate feed. In that case, the ERU would operate in 100% recirculation mode.
4. With this emergency gas heater augmentation, classrooms will he maintained at around
65"-67"F hyVRF and the Administration area will he maintained at about 60"F hyVRF'
down to outside temperature of about -1 °
.
5. Be|0vv 13"F' gas heat 0n the ERU can still operate t0 keep the building above
freezing. The Administrative area receives only rninirnG| amount of air from the ERU' so the
room doors would need t0heopen.
G. The estimated equipment upcharge to add a gas furnace is approximately$6,000.
Therefore, it is the Ue8ignteGrn'8 recommendation to proceed with adding G gas furnace t0the
project to he used only in emergency situations.
/053B Memorandum//B'0/'20 Gas Heating ReoR/B'02'0/
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AGENDA ITEM SUMMARY
LEXINGTON JOINT BOARD OF SELECTMEN AND SCHOOL COMMITTEE MEETING
AGENDA ITEM TITLE:
Anticipated Adjournment
PRESENTER: ITEM
NUMBER:
SUMMARY:
SUGGESTED MOTION:
FOLLOW-UP:
DATE AND APPROXIMATE TIME ON AGENDA:
8/28/2018 6:30 p.m.